RiverCityGraphix

The Limit Bio plugin allows you to quickly limit the character count on the biographical information field on the edit profile page of your site.
Features:
<ul>
<li>Admin settings to restrict the biography character count site wide.</li>
<li>Limits Users to a specific character count in their bio</li>
<li>Displays the remaining characters allowed and updates in real time as the user types.</li>
<li>Works even if Javascript is disabled</li>
<li>Stops a user from typing when the character count is reached</li>
<li>Replaces the default biographical information field in the wordpress profile</li>
</ul>

Limit Bio

The Limit Bio plugin allows you to quickly limit the character count on the biographical information field on the edit profile page of your site.

jmarreros

This Plugin shows author’s biography in the foot of the posts, also adds 
social networks and a link to see all the entries written by the author.

Simple Author Bio

Plugin that shows the author's biography in the foot of the posts.

Limit Bio vs Simple Author Bio